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Knaus-Ogino method: how it works!

by Josephine Andrews
Published: Last Updated on 367 views

The Knaus-Ogino method is one of the natural methods of contraception. You have to record your cycle precisely in order to be able to calculate the fertile and infertile days. Because the cycle should be logged daily for at least six months, preferably over a year, the method is also called the calendar method. Learn more about the Knaus-Ogino method.

What is the Knaus-Ogino calculation?

In the 1930s, the Austrian doctor Knaus and his Japanese colleague Ogino developed the calendar method of contraception that bears their name. It is based on the knowledge that ovulation occurs roughly in the middle of a cycle. However, because a woman’s cycle is subject to fluctuations and is not always exactly the same length, you must record each cycle carefully for at least six months, ideally over a whole year, i.e. keep a daily record.

A cycle always begins on the first day of a menstrual period. Record exactly when the bleeding starts and how long it lasts. You must also note any physical changes, stress and illnesses, operations, medication and diets, and travel with time differences, because all of these factors can influence your cycle.

How do you calculate with the calendar method according to Knaus-Ogino?

Once you have logged your monthly cycle for 12 months, you can start calculating the fertile and infertile days. First, take your shortest cycle from your notes and subtract 18 days from that. For example, if the shortest cycle was 26 days, you get (26 – 18 =) 8 as a result. So the first fertile day would be the eighth day of your cycle.

To determine the last fertile day, subtract 11 days from the longest cycle recorded. So, in our example, if the longest cycle was 30 days, then day 19 of your cycle would be the last fertile day. Conceptually, conception would therefore be possible from the 8th to the 19th day of your cycle.

In order to improve the safety of the method according to Knaus-Ogino, you should definitely consider the viability of the sperm and egg cells: Sperm are viable for three days, so subtract another three days from the beginning of your fertile period. Add one day to the end of the fertile period – that’s how long the egg cell is viable.

If you want to use the Knaus-Ogino method for contraception, longer phases of sexual abstinence are required if other contraceptive methods are not used.

The safety of the Knaus-Ogino method

According to the WHO, the Pearl Index is between 5 and 12 for the calendar method. This means that if 100 women use only the Knaus-Ogino method for one year, 5 to 12 of them will still become pregnant. So it’s a fairly unsafe method that isn’t particularly good for birth control. But it is a good way for women who want to have children to find out when the probably most fertile time in their cycle is.

Knaus-Ogino as the basis for combined methods

If you want to optimize the safety of contraception, take Knaus-Ogino as a basis and combine the method with the Billings method or the basal body temperature curve. You can use it to improve the Pearl Index to values ​​between 0.8 and 10.

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